fs/hfsplus/catalog.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/fs/hfsplus/catalog.c
   4  *
   5  * Copyright (C) 2001
   6  * Brad Boyer ([email protected])
   7  * (C) 2003 Ardis Technologies <[email protected]>
   8  *
   9  * Handling of catalog records
  10  */
  11
  12
  13 #include "hfsplus_fs.h"
  14 #include "hfsplus_raw.h"
  15
  16 int hfsplus_cat_case_cmp_key(const hfsplus_btree_key *k1,
  17                              const hfsplus_btree_key *k2)
  18 {
  19         __be32 k1p, k2p;
  20
  21         k1p = k1->cat.parent;
  22         k2p = k2->cat.parent;
  23         if (k1p != k2p)
  24                 return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
  25
  26         return hfsplus_strcasecmp(&k1->cat.name, &k2->cat.name);
  27 }
  28
  29 int hfsplus_cat_bin_cmp_key(const hfsplus_btree_key *k1,
  30                             const hfsplus_btree_key *k2)
  31 {
  32         __be32 k1p, k2p;
  33
  34         k1p = k1->cat.parent;
  35         k2p = k2->cat.parent;
  36         if (k1p != k2p)
  37                 return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
  38
  39         return hfsplus_strcmp(&k1->cat.name, &k2->cat.name);
  40 }
  41
  42 /* Generates key for catalog file/folders record. */
  43 int hfsplus_cat_build_key(struct super_block *sb,
  44                 hfsplus_btree_key *key, u32 parent, const struct qstr *str)
  45 {
  46         int len, err;
  47
  48         key->cat.parent = cpu_to_be32(parent);
  49         err = hfsplus_asc2uni(sb, &key->cat.name, HFSPLUS_MAX_STRLEN,
  50                         str->name, str->len);
  51         if (unlikely(err < 0))
  52                 return err;
  53
  54         len = be16_to_cpu(key->cat.name.length);
  55         key->key_len = cpu_to_be16(6 + 2 * len);
  56         return 0;
  57 }
  58
  59 /* Generates key for catalog thread record. */
  60 void hfsplus_cat_build_key_with_cnid(struct super_block *sb,
  61                         hfsplus_btree_key *key, u32 parent)
  62 {
  63         key->cat.parent = cpu_to_be32(parent);
  64         key->cat.name.length = 0;
  65         key->key_len = cpu_to_be16(6);
  66 }
  67
  68 static void hfsplus_cat_build_key_uni(hfsplus_btree_key *key, u32 parent,
  69                                       struct hfsplus_unistr *name)
  70 {
  71         int ustrlen;
  72
  73         ustrlen = be16_to_cpu(name->length);
  74         key->cat.parent = cpu_to_be32(parent);
  75         key->cat.name.length = cpu_to_be16(ustrlen);
  76         ustrlen *= 2;
  77         memcpy(key->cat.name.unicode, name->unicode, ustrlen);
  78         key->key_len = cpu_to_be16(6 + ustrlen);
  79 }
  80
  81 void hfsplus_cat_set_perms(struct inode *inode, struct hfsplus_perm *perms)
  82 {
  83         if (inode->i_flags & S_IMMUTABLE)
  84                 perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
  85         else
  86                 perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
  87         if (inode->i_flags & S_APPEND)
  88                 perms->rootflags |= HFSPLUS_FLG_APPEND;
  89         else
  90                 perms->rootflags &= ~HFSPLUS_FLG_APPEND;
  91
  92         perms->userflags = HFSPLUS_I(inode)->userflags;
  93         perms->mode = cpu_to_be16(inode->i_mode);
  94         perms->owner = cpu_to_be32(i_uid_read(inode));
  95         perms->group = cpu_to_be32(i_gid_read(inode));
  96
  97         if (S_ISREG(inode->i_mode))
  98                 perms->dev = cpu_to_be32(inode->i_nlink);
  99         else if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode))
 100                 perms->dev = cpu_to_be32(inode->i_rdev);
 101         else
 102                 perms->dev = 0;
 103 }
 104
 105 static int hfsplus_cat_build_record(hfsplus_cat_entry *entry,
 106                 u32 cnid, struct inode *inode)
 107 {
 108         struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
 109
 110         if (S_ISDIR(inode->i_mode)) {
 111                 struct hfsplus_cat_folder *folder;
 112
 113                 folder = &entry->folder;
 114                 memset(folder, 0, sizeof(*folder));
 115                 folder->type = cpu_to_be16(HFSPLUS_FOLDER);
 116                 if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags))
 117                         folder->flags |= cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT);
 118                 folder->id = cpu_to_be32(inode->i_ino);
 119                 HFSPLUS_I(inode)->create_date =
 120                         folder->create_date =
 121                         folder->content_mod_date =
 122                         folder->attribute_mod_date =
 123                         folder->access_date = hfsp_now2mt();
 124                 hfsplus_cat_set_perms(inode, &folder->permissions);
 125                 if (inode == sbi->hidden_dir)
 126                         /* invisible and namelocked */
 127                         folder->user_info.frFlags = cpu_to_be16(0x5000);
 128                 return sizeof(*folder);
 129         } else {
 130                 struct hfsplus_cat_file *file;
 131
 132                 file = &entry->file;
 133                 memset(file, 0, sizeof(*file));
 134                 file->type = cpu_to_be16(HFSPLUS_FILE);
 135                 file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
 136                 file->id = cpu_to_be32(cnid);
 137                 HFSPLUS_I(inode)->create_date =
 138                         file->create_date =
 139                         file->content_mod_date =
 140                         file->attribute_mod_date =
 141                         file->access_date = hfsp_now2mt();
 142                 if (cnid == inode->i_ino) {
 143                         hfsplus_cat_set_perms(inode, &file->permissions);
 144                         if (S_ISLNK(inode->i_mode)) {
 145                                 file->user_info.fdType =
 146                                         cpu_to_be32(HFSP_SYMLINK_TYPE);
 147                                 file->user_info.fdCreator =
 148                                         cpu_to_be32(HFSP_SYMLINK_CREATOR);
 149                         } else {
 150                                 file->user_info.fdType =
 151                                         cpu_to_be32(sbi->type);
 152                                 file->user_info.fdCreator =
 153                                         cpu_to_be32(sbi->creator);
 154                         }
 155                         if (HFSPLUS_FLG_IMMUTABLE &
 156                                         (file->permissions.rootflags |
 157                                         file->permissions.userflags))
 158                                 file->flags |=
 159                                         cpu_to_be16(HFSPLUS_FILE_LOCKED);
 160                 } else {
 161                         file->user_info.fdType =
 162                                 cpu_to_be32(HFSP_HARDLINK_TYPE);
 163                         file->user_info.fdCreator =
 164                                 cpu_to_be32(HFSP_HFSPLUS_CREATOR);
 165                         file->user_info.fdFlags =
 166                                 cpu_to_be16(0x100);
 167                         file->create_date =
 168                                 HFSPLUS_I(sbi->hidden_dir)->create_date;
 169                         file->permissions.dev =
 170                                 cpu_to_be32(HFSPLUS_I(inode)->linkid);
 171                 }
 172                 return sizeof(*file);
 173         }
 174 }
 175
 176 static int hfsplus_fill_cat_thread(struct super_block *sb,
 177                                    hfsplus_cat_entry *entry, int type,
 178                                    u32 parentid, const struct qstr *str)
 179 {
 180         int err;
 181
 182         entry->type = cpu_to_be16(type);
 183         entry->thread.reserved = 0;
 184         entry->thread.parentID = cpu_to_be32(parentid);
 185         err = hfsplus_asc2uni(sb, &entry->thread.nodeName, HFSPLUS_MAX_STRLEN,
 186                                 str->name, str->len);
 187         if (unlikely(err < 0))
 188                 return err;
 189
 190         return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
 191 }
 192
 193 /* Try to get a catalog entry for given catalog id */
 194 int hfsplus_find_cat(struct super_block *sb, u32 cnid,
 195                      struct hfs_find_data *fd)
 196 {
 197         hfsplus_cat_entry tmp;
 198         int err;
 199         u16 type;
 200
 201         hfsplus_cat_build_key_with_cnid(sb, fd->search_key, cnid);
 202         err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
 203         if (err)
 204                 return err;
 205
 206         type = be16_to_cpu(tmp.type);
 207         if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
 208                 pr_err("found bad thread record in catalog\n");
 209                 return -EIO;
 210         }
 211
 212         if (be16_to_cpu(tmp.thread.nodeName.length) > 255) {
 213                 pr_err("catalog name length corrupted\n");
 214                 return -EIO;
 215         }
 216
 217         hfsplus_cat_build_key_uni(fd->search_key,
 218                 be32_to_cpu(tmp.thread.parentID),
 219                 &tmp.thread.nodeName);
 220         return hfs_brec_find(fd, hfs_find_rec_by_key);
 221 }
 222
 223 static void hfsplus_subfolders_inc(struct inode *dir)
 224 {
 225         struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
 226
 227         if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
 228                 /*
 229                  * Increment subfolder count. Note, the value is only meaningful
 230                  * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
 231                  */
 232                 HFSPLUS_I(dir)->subfolders++;
 233         }
 234 }
 235
 236 static void hfsplus_subfolders_dec(struct inode *dir)
 237 {
 238         struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
 239
 240         if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
 241                 /*
 242                  * Decrement subfolder count. Note, the value is only meaningful
 243                  * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
 244                  *
 245                  * Check for zero. Some subfolders may have been created
 246                  * by an implementation ignorant of this counter.
 247                  */
 248                 if (HFSPLUS_I(dir)->subfolders)
 249                         HFSPLUS_I(dir)->subfolders--;
 250         }
 251 }
 252
 253 int hfsplus_create_cat(u32 cnid, struct inode *dir,
 254                 const struct qstr *str, struct inode *inode)
 255 {
 256         struct super_block *sb = dir->i_sb;
 257         struct hfs_find_data fd;
 258         hfsplus_cat_entry entry;
 259         int entry_size;
 260         int err;
 261
 262         hfs_dbg(CAT_MOD, "create_cat: %s,%u(%d)\n",
 263                 str->name, cnid, inode->i_nlink);
 264         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
 265         if (err)
 266                 return err;
 267
 268         hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
 269         entry_size = hfsplus_fill_cat_thread(sb, &entry,
 270                 S_ISDIR(inode->i_mode) ?
 271                         HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
 272                 dir->i_ino, str);
 273         if (unlikely(entry_size < 0)) {
 274                 err = entry_size;
 275                 goto err2;
 276         }
 277
 278         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 279         if (err != -ENOENT) {
 280                 if (!err)
 281                         err = -EEXIST;
 282                 goto err2;
 283         }
 284         err = hfs_brec_insert(&fd, &entry, entry_size);
 285         if (err)
 286                 goto err2;
 287
 288         err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
 289         if (unlikely(err))
 290                 goto err1;
 291
 292         entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
 293         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 294         if (err != -ENOENT) {
 295                 /* panic? */
 296                 if (!err)
 297                         err = -EEXIST;
 298                 goto err1;
 299         }
 300         err = hfs_brec_insert(&fd, &entry, entry_size);
 301         if (err)
 302                 goto err1;
 303
 304         dir->i_size++;
 305         if (S_ISDIR(inode->i_mode))
 306                 hfsplus_subfolders_inc(dir);
 307         dir->i_mtime = dir->i_ctime = current_time(dir);
 308         hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
 309
 310         hfs_find_exit(&fd);
 311         return 0;
 312
 313 err1:
 314         hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
 315         if (!hfs_brec_find(&fd, hfs_find_rec_by_key))
 316                 hfs_brec_remove(&fd);
 317 err2:
 318         hfs_find_exit(&fd);
 319         return err;
 320 }
 321
 322 int hfsplus_delete_cat(u32 cnid, struct inode *dir, const struct qstr *str)
 323 {
 324         struct super_block *sb = dir->i_sb;
 325         struct hfs_find_data fd;
 326         struct hfsplus_fork_raw fork;
 327         struct list_head *pos;
 328         int err, off;
 329         u16 type;
 330
 331         hfs_dbg(CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
 332         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
 333         if (err)
 334                 return err;
 335
 336         if (!str) {
 337                 int len;
 338
 339                 hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
 340                 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 341                 if (err)
 342                         goto out;
 343
 344                 off = fd.entryoffset +
 345                         offsetof(struct hfsplus_cat_thread, nodeName);
 346                 fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
 347                 hfs_bnode_read(fd.bnode,
 348                         &fd.search_key->cat.name.length, off, 2);
 349                 len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
 350                 hfs_bnode_read(fd.bnode,
 351                         &fd.search_key->cat.name.unicode,
 352                         off + 2, len);
 353                 fd.search_key->key_len = cpu_to_be16(6 + len);
 354         } else {
 355                 err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
 356                 if (unlikely(err))
 357                         goto out;
 358         }
 359
 360         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 361         if (err)
 362                 goto out;
 363
 364         type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
 365         if (type == HFSPLUS_FILE) {
 366 #if 0
 367                 off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
 368                 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
 369                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
 370 #endif
 371
 372                 off = fd.entryoffset +
 373                         offsetof(struct hfsplus_cat_file, rsrc_fork);
 374                 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
 375                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
 376         }
 377
 378         /* we only need to take spinlock for exclusion with ->release() */
 379         spin_lock(&HFSPLUS_I(dir)->open_dir_lock);
 380         list_for_each(pos, &HFSPLUS_I(dir)->open_dir_list) {
 381                 struct hfsplus_readdir_data *rd =
 382                         list_entry(pos, struct hfsplus_readdir_data, list);
 383                 if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
 384                         rd->file->f_pos--;
 385         }
 386         spin_unlock(&HFSPLUS_I(dir)->open_dir_lock);
 387
 388         err = hfs_brec_remove(&fd);
 389         if (err)
 390                 goto out;
 391
 392         hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
 393         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 394         if (err)
 395                 goto out;
 396
 397         err = hfs_brec_remove(&fd);
 398         if (err)
 399                 goto out;
 400
 401         dir->i_size--;
 402         if (type == HFSPLUS_FOLDER)
 403                 hfsplus_subfolders_dec(dir);
 404         dir->i_mtime = dir->i_ctime = current_time(dir);
 405         hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
 406
 407         if (type == HFSPLUS_FILE || type == HFSPLUS_FOLDER) {
 408                 if (HFSPLUS_SB(sb)->attr_tree)
 409                         hfsplus_delete_all_attrs(dir, cnid);
 410         }
 411
 412 out:
 413         hfs_find_exit(&fd);
 414
 415         return err;
 416 }
 417
 418 int hfsplus_rename_cat(u32 cnid,
 419                        struct inode *src_dir, const struct qstr *src_name,
 420                        struct inode *dst_dir, const struct qstr *dst_name)
 421 {
 422         struct super_block *sb = src_dir->i_sb;
 423         struct hfs_find_data src_fd, dst_fd;
 424         hfsplus_cat_entry entry;
 425         int entry_size, type;
 426         int err;
 427
 428         hfs_dbg(CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n",
 429                 cnid, src_dir->i_ino, src_name->name,
 430                 dst_dir->i_ino, dst_name->name);
 431         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
 432         if (err)
 433                 return err;
 434         dst_fd = src_fd;
 435
 436         /* find the old dir entry and read the data */
 437         err = hfsplus_cat_build_key(sb, src_fd.search_key,
 438                         src_dir->i_ino, src_name);
 439         if (unlikely(err))
 440                 goto out;
 441
 442         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
 443         if (err)
 444                 goto out;
 445         if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) {
 446                 err = -EIO;
 447                 goto out;
 448         }
 449
 450         hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
 451                                 src_fd.entrylength);
 452         type = be16_to_cpu(entry.type);
 453
 454         /* create new dir entry with the data from the old entry */
 455         err = hfsplus_cat_build_key(sb, dst_fd.search_key,
 456                         dst_dir->i_ino, dst_name);
 457         if (unlikely(err))
 458                 goto out;
 459
 460         err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
 461         if (err != -ENOENT) {
 462                 if (!err)
 463                         err = -EEXIST;
 464                 goto out;
 465         }
 466
 467         err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
 468         if (err)
 469                 goto out;
 470         dst_dir->i_size++;
 471         if (type == HFSPLUS_FOLDER)
 472                 hfsplus_subfolders_inc(dst_dir);
 473         dst_dir->i_mtime = dst_dir->i_ctime = current_time(dst_dir);
 474
 475         /* finally remove the old entry */
 476         err = hfsplus_cat_build_key(sb, src_fd.search_key,
 477                         src_dir->i_ino, src_name);
 478         if (unlikely(err))
 479                 goto out;
 480
 481         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
 482         if (err)
 483                 goto out;
 484         err = hfs_brec_remove(&src_fd);
 485         if (err)
 486                 goto out;
 487         src_dir->i_size--;
 488         if (type == HFSPLUS_FOLDER)
 489                 hfsplus_subfolders_dec(src_dir);
 490         src_dir->i_mtime = src_dir->i_ctime = current_time(src_dir);
 491
 492         /* remove old thread entry */
 493         hfsplus_cat_build_key_with_cnid(sb, src_fd.search_key, cnid);
 494         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
 495         if (err)
 496                 goto out;
 497         type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
 498         err = hfs_brec_remove(&src_fd);
 499         if (err)
 500                 goto out;
 501
 502         /* create new thread entry */
 503         hfsplus_cat_build_key_with_cnid(sb, dst_fd.search_key, cnid);
 504         entry_size = hfsplus_fill_cat_thread(sb, &entry, type,
 505                 dst_dir->i_ino, dst_name);
 506         if (unlikely(entry_size < 0)) {
 507                 err = entry_size;
 508                 goto out;
 509         }
 510
 511         err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
 512         if (err != -ENOENT) {
 513                 if (!err)
 514                         err = -EEXIST;
 515                 goto out;
 516         }
 517         err = hfs_brec_insert(&dst_fd, &entry, entry_size);
 518
 519         hfsplus_mark_inode_dirty(dst_dir, HFSPLUS_I_CAT_DIRTY);
 520         hfsplus_mark_inode_dirty(src_dir, HFSPLUS_I_CAT_DIRTY);
 521 out:
 522         hfs_bnode_put(dst_fd.bnode);
 523         hfs_find_exit(&src_fd);
 524         return err;
 525 }